Interfacing nuclear spins in quantum dots to cavity or traveling-wave fields

Abstract

We show how to realize a quantum interface between optical fields and the polarized nuclear spins in a singly charged quantum dot, which is strongly coupled to a high-finesse optical cavity. An effective direct coupling between cavity and nuclear spins is obtained by adiabatically eliminating the (far detuned) excitonic and electronic states. The requirements needed to map qubit and continuous variable states of cavity or traveling-wave fields to the collective nuclear spin are investigated: For cavity fields, we consider adiabatic passage processes to transfer the states. It is seen that a significant improvement in cavity lifetimes beyond present-day technology would be required for a quantum interface. We then turn to a scheme which couples the nuclei to the output field of the cavity and can tolerate significantly shorter cavity lifetimes. We show that the lifetimes reported in the literature and the recently achieved nuclear polarization of ~90% allow both high-fidelity read-out and write-in of quantum information between the nuclear spins and the output field. We discuss the performance of the scheme and provide a convenient description of the dipolar dynamics of the nuclei for highly polarized spins, demonstrating that this process does not affect the performance of our protocol.

37 pages, 14 figures

References in corpus (19)

• Quantum information with continuous variables
• Quantum nature of a strongly-coupled single quantum dot-cavity system
• Experimental demonstration of quantum memory for light
• Mapping photonic entanglement into and out of a quantum memory
• Extremality of Gaussian quantum states
• Optical pumping of electronic and nuclear spin in single charge-tunable quantum dots
• Theory of electron spin decoherence by interacting nuclear spins in a quantum dot
• Adiabatic Elimination in a Lambda System
• Theory of control of spin/photon interface for quantum networks
• Remote preparation of an atomic quantum memory
• Quantum benchmark for storage and transmission of coherent states
• Optimal entanglement witnesses for continuous-variable systems
• Dynamics of Quantum Dot Nuclear Spin Polarization Controlled by a Single Electron
• Demagnetization of Quantum Dot Nuclear Spins: Breakdown of the Nuclear Spin Temperature Approach
• Efficient dynamical nuclear polarization in quantum dots: Temperature dependence
• Qubit protection in nuclear-spin quantum dot memories
• Overhauser effect in individual InP/GaInP dots
• A quantum interface between light and nuclear spins in quantum dots
• Continuous variable versus EIT-based quantum memories

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